非正式

fēizhèngshì
unofficial; informal

CEDICT

  1. (attributive) informal
  2. (attributive) unofficial
  3. informal
  4. unofficial

Wiktionary

不是正式的，相對於正式而言。

重編國語辭典

Entry Composition

1 非 fēi
  1. to not be; not
  2. wrong; incorrect
  3. non-; un-; in-; de-
  4. to reproach; to blame
  5. (coll.) to insist on; simply must
2 正式 zhèngshì formal; official

Related entries

非公式 fēigōngshì unofficial; informal